The two biosolids had a much lower percentage of mineralisable N than urea, and the N uptake with ADB was about half that with ANDB.
From the results for N uptake, it can be seen that the calculated percentage mineralised N for ANDB is the same on both soil types (~40%), within experimental error.
1] of the ANDB on the clay loam and sandy soils, respectively.
For comparison, Table 6 summarises the results from several experiments conducted on ANDB and ADB under different climatic conditions, with different soil types, using different techniques for the estimation of the mineralisable organic N.
The Victorian guidelines for land application of biosolids recommends the use of 15% and 25% mineralisation rates of organic N for calculating the amount of PAN from ANDB and ADB, respectively (EPA Victoria 2004).